Functional Description; Electrical Circuitry - Oce 3121 Technical & Service Manual

Functional description

1 Electrical Circuitry

Control
The Océ 3121's electrical mechanisms are controller by the CPU on the PBAs
shown in the "Block diagram of the CPU". See the tables for an idea of the
functions of the CPU and the functions of the ROMs/RAMs and the ICs around
the CPU.
Image Processor PBA
Name
CPU
ROM
(FLASH
ROM)
MASK
ROM
RAM
DP RAM
ed.1
IC No Description
IC506 Controls the image processing
Controls the laser operation
Controls the job schedules
Controls the fax sequence
Controls the system memory
Detects errors
Controls the communications with the DC control PBA
Controls the serial communications (for FLASH ROM
downloading)
Controls the control panel
Controls the feeder/editor
Controls the fax communications
Controls the copying sequence
Controls the power supply
Controls the communication with the control panel
ROM Contains the control programmes
DIMM Controls the copying operations
IC1 Controls the fax operations
IC2 Control panel message
IC564 Controls the fonts (e.g., the fonts used for the fax head-
ers)
IC650 Stores the service mode, the user mode, and various
IC651 parameters
IC528 Controls the communications with the DC control PBA
22 Power & Control 501